Speed-indicating mechanism.



B. M. W. HANSON & W. T. SBA-RS. SPEED INDIGATINGMEGHANISM. 7 APPLICATION IILED JAN/25,1913. v

W; Patented Feb. 10, 1914.

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entrain s'rarns PATENT OFFICE.

BEN'G'T M. V7. HANSON AND WILLARD T. SEARS, OF HARTFORD, CONNECTICUT, ASSIGN- ORS TO PRATT & -\IVHI'INEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORA- TION OF NEW JERSEY.

SPEED--INDICATIN G MECHANISM.

To all whom it may concern e it known that we, Bnuor M. N. HAN- SON and Wintann T. SEARS, citizens of the United States, residingat Hartford, in the I county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Speed-Indicating Mechanism, of which the following is a specification.

This invention relates to speed-indicating mechanism, one of the primary objects of the invention being to provide simple and effective means by which with the aid of a we may depart therefrom in several respects within the scope of the invention defined by our claims.

Referring to said drawings: Figure 1 is a sectional elevation of a machine equipped with speed-indicating means involving our invention. Fig. 2 is an elevation of a gage member, its casing and portion of the traming. Fig. 3 is a view as seen from the right in Fig. 2.

Like characters refer to like parts throughout the several views, which are on ditlereut scales.

Our speed indicating mechanism can be used with advantage in connection with widely dili ercnt types oi. machines, being intcndtal principally to indicate, with the aid of a suitable device, the speed of rotation of a tool The mechanism is of particular utility when employed in conjunction. with a tool ha ring an irregular or interrupted surlarc, such as a drili or milling cutter these being two types of tools, and which owing to th form cannot ha vc a SpQOCl-IllQftSlll'll'lg dcvu applied to dieir peripheries. It is he custom ordinarily when it is desired to aa'rrtaiz'i the surface or peripheral speed t' a tool to obtain the revolutions per minulr oi the spindle to which said tool is con- Specification of Letters Patent.

Application filed January 25, 1913.

Patented Feb. 10, 1.914. Serial No. 744,117.

nected and then being given the diameter of said tool, to compute from the tool, he desired information. Ve provide means by which can be instantly and correctly determined the peripheral speed of a tool, and this is accomplished by providing a gage member rotative with the tool-spindle at a definite speed proportion therewith. lVhen we indicate this gage member is rotative with the spindle we do not necessarily mean to imply that it is driven thereby, although this is our preferred relation. Ordinarily the gage member is located at a point remote from the tool so as to be out of the range. of the chips being cut or the oil employed in lubricating the tool.

In Fig. 1 of the drawings we have represented a portion of a radial-drill and will hereinafter briefly describe the same with the object of showing the purpose of the speed-indicating mechanism. As will be clear we do not restrict ourselves in this particular as the appliance can be used equally as well in conjunction with other kinds of metal-working machines, those working on wood and any other like fields where the objects stated are requisite. Nor do we limit ourselves to any particular form of gageanember but have secured excellent etlects by providing 'one of conical form, thereby adapting the gage member for coaction with tools of various diameters. When the gage member is stepped, each step corresponds with a tool of a certain size, although the steps need not be of the same diameter as the tools which are coaetive respectively therewith.

In Fig. 1 of the drawings 2 indicates the horizontal arm which extends from the vertical column (not shown) of a radial drill, said arm 2 being provided with the spindle 3 provided with means as is custonnrry to ren'iovably receive and securely hold a drill as 4. As already observed the gage-member operatively associated with the spindle 3 may vary decidedly as to character, although the conical one shown and denoted in a general way by has met all the desired conditions. This gage member 5 .is opcrativc with the drill spindle 3 and necessarily with the drill 4 carried thereby this condition in the showing made beingzuycome plished by driving the gage member 5 from the spindle and any suitable means maybe utilized for this purpose. While in the organization illustrated the gage member 5 is driven at the same speed as the spindle, this.

gage member with said shaft. The arm or frame member 2 is equipped with a shell or guard 10 for the gage-member, of the same general shape as the latter, said shell or guard being slotted as at 11 sufficiently to permit the application of a speedometer or cut-meter to the appropriate peripheral portion of the conical gage-member to determine thereby the speed of rotation of the particular tool rotatively connected with the spindle 3. The gage-member 5 when of conical form has preferably steps, each step being cylindrical, and although there are sixteen of such steps shown, this number is arbitrary, the number of steps depending generally upon the number of. sizes of drills or like tools. The guard 10 has on it a scale 13 with marks reading from to 2%, the numbers being apart and indicating tool sizes. The drill 4 is a t;;- inch one. In the organizatioi-i shown the step of the conical gage member 5 opposite the if} mark on the scale 13 cooperates with this particular drill, and although in this particular organiza' tion and as a matter of preference and advantage, the peripheral speed of this step or indicating, portion is the same as that of the. drill 4, this is not essential in all cases, as such speeds might'vary and a correct reading in this event, obtained by the use of an appropriate cut meter 01' otherwise. It will be seen that each indicating-portion of the gage member is smooth and uninterrupted which is advantageous in as by this, extreme accuracy is assured.

It will be clear that the gage member has means at different points thereof for driving a speed measuring device at various speeds withoutchanging the speed of rotation of the spindle.

What I claim is:

l. A gage-member having a tool'speedindicating portion, combined with a spindle for receiving tools of different sizes, and means operative with the spindle, for driving said gage-member, to cause the indicating portion thereof to travel at a definite speed proportion with that of the particular tool carried by said spindle.

2. The combination with a spindle for receivin tools of different sizes, a stepped conica gage member, each step constituting a tool speed indicating portion, and means operative with the spindle, for rotating said gage member, so that the peripheral speed of. each indicating portion thereof will be in a definite proportion to that of the particular tool carried by said spindle.

3. The combination with a tool spindle for receiving tools of different sizes, a shaft disposed transversely to the tool spindle, a gage member fastened to the outer end of said shaft for rotation therewith and having a'tool speed indicating portion, and means for rotating said shaft and therefore said gage member from said tool spindle, to cause the rotation of said gage member a definite speed-proportion to that of the particular tool carried by said spindle.

In testimony whereof we atiix our signatures in presence of two witnesses.

BEN lrfl M. W. HANSON.

\VILLARD T. SFARS.

Witnesses:

W. M. S'ronas, II. \V. Kinnotnixs. 

